Two-cycle engine



0. N; PACKER. TWO CYCLE ENGINE.

APPLICATION FILED NOV. ID, 1920.

Patented Aug. 30, 1921.

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-'I'WO-CYCLE ENGINE.

Specification of Letters Patent. Patented Aug. 30,. 1921.

Application filed November 10, 1920. Serial No. 423,064.

To all whom it may concern Be it known that I, COURTLAND N. PACKER, acitizen of the United States, residing at the city of Battle Creek,county of Calhoun, State of Michigan, have invented certain new anduseful Improvements in Two-Cycle Engines, of which the following is aspecification.

Thisinvention relates to improvements in two cycle engines.

The main object of this invention is to provide an improved two cycleengine in Which the piston is so formed and the inlet and exhaustpassages are so arranged that the piston does not expand to such adegree, even when the engine is operated for a long period of time, asto cause undue friction with the cylinder walls. i

A further object is to provide in a two cycle engine an improvedarrangement of inlet and exhaust in which the burned gasses areeffectively discharged from the cylinder.

Further objects, and objects relating to structural details, willdefinitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and meansdescribed in the following specification. The invention is clearlydefined and pointed out in the claims.

A structure which is the preferred embodiment of my invention is clearlyillustrated in the accompanying drawing forming a part of thisspecificatiomin which:

Figure I is a side elevation of a two cycle engine embodying thefeatures of my invention looking from the left of Fig. II, crank caseand parts contained thereinor mounted thereon being broken away.

Fig. II is a detail view mainly in vertical section on a linecorresponding to line 2-2 of Fig. I.

Fig. III is a horizontal section on a line corresponding to line 3-3 ofFigs. I and II.

In the drawing similar reference characters refer to similar partsthroughout the several views, and the sectional views are taken lookingin the direction of the little arrows at the ends of the section lines.

Referring to the drawing, the cylinder 1 is in the structure illustratedprovided with awater jacket. Thepiston 2 is provided with a centrallydisposed inverted conical recess 3 and an exhaust passage 4 leading fromthe inner end of this recess. The cylinder is provided with an exhaustport 5 with which the passage 4 registers when the piston is at the endof its instroke. The cylinder is provided with an inlet port 6positioned beyond the outstroke of the piston, the outer position of thepiston being indicated by the dotted line 7 in Fig. II.

At the inner end of thepiston is a, compression chamber 8. Thiscompression chamber opens into a passage'Q in the wallet the cylinder,the passage having an inlet port 10 connected to a carbureter 11 shownconventionally, and a discharge port 12 connected to the inlet port 6 ofthe cylinder by the pipe 13. This pipe 13 has a pair of check valves 14.

The cylinder is provided with a set of piston rings 15 at its head end,these piston. rings being positioned above the passage 4 so that therings do not cross the exhaust port 5 during the stroke of the piston.

The piston is provided with aset of rings 16 at its inner end, and thestroke of the piston is such that these rings do not cross the port 5.This obviates wear on the rings and the cylinder around the port. aswhen the rings cross the port during the stroke of the piston there is atendency for the rings to spring into the port.

The conical recess in the head of the piston has a wall of substantiallythe thickness of the side walls of the piston, and by providing thisrecess I not'only am enabled to locate the inlet and discharge port as Ihave time, to such an extent as to cause undue friction of the cylinderwalls.

My improved engine is very simple and economical in structure and highlyefficient.

Having thus described my invention, what I claim as new and desire tosecure by Let ters Patent, is: 7

1. In a two cycle engine. the combination of a cylinder and a pistonhaving a centrally disposed inverted conical recess in its head and anexhaust passage leading from the inner end of said recess, said cylinderbeing provided with an exhaust port with which said piston passageregisters when the piston' is at the end of its in-stroke, and with aninlet port opening into the cylinder at a point beyond the out stroke ofthe'piston, there being a compression chamber at the inner end of thepiston provided with a delivery connection to said inlet port and pistonrings at the ends of said piston, the rings at the head end of thepiston being at the outer side of the exhaust passage of said piston.

2. In a two cycle engine, the combination of a cylinder and a pistonhaving a centrally disposed inverted conical recess in its head and anexhaust passage leading from the inner end of said recess, said cylinderbeing provided with an exhaust port with which said piston passageregisters when the piston is at the end of its in-stroke, and with aninlet port opening into the cylinder at apoint beyond the out stroke ofthe piston, there being a compression chamber at the inner end of thepiston provided with a delivery connection to said inlet port, said being provided with piston rings at the outer side of the exhaust passageof said piston.

3. Ina two cycle engine, the combination of a cylinder and a pistonhaving a centrally disposed inverted'conical recess in its head and anexhaust passage leading from the inner end of said recess. said cylinderbeing provided with an exhaust port With which said pistonpassa'ge'registers when the pis ton is at the end of its in-stroke, andwith an inlet port opening intothe cylinder at a point beyond theoutstroke of the piston.

In witness whereofI have-hereunto set my hand and seal in the presenceof two witnesses. COURTLAND N. PACKER. [L. s.]

Witnesses:

LUELLA G. GREENFIELD, MARGARET L. GLAsoow.

